Diffusion in a system of a few distinguishable fermions in a one-dimensional double-well potential

TL;DR

This paper investigates how interactions affect the tunneling dynamics of a few ultra-cold fermions in a double-well potential, revealing complex behavior beyond single-particle models.

Contribution

It demonstrates the impact of strong interactions on fermion tunneling dynamics, highlighting effects not explained by single-particle theories.

Findings

Strong interactions alter tunneling speed in fermion systems

Particle flow can be accelerated or slowed by interactions

Spectrum analysis clarifies the interaction effects

Abstract

Dynamical properties of a few ultra-cold fermions confined in a double-well potential is studied. We show that the dynamics, which is governed by single-particle tunnelings for vanishing interactions, is completely different for strong interactions. Depending on the details of the configuration, for sufficiently strong interactions (repulsions or attractions) the particle flow through the barrier can be accelerated or slowed down. This effect cannot be explained with the single-particle picture. It is clarified with direct inspection to the spectrum of the few-body Hamiltonian.